diff --git a/mrjob/requirements.txt b/mrjob/requirements.txt
index 0ad4b3c..f00d313 100644
--- a/mrjob/requirements.txt
+++ b/mrjob/requirements.txt
@@ -1,7 +1,7 @@
 boto3==1.10.19
 botocore==1.13.19
 cachetools==3.1.1
-certifi==2019.9.11
+certifi==2022.12.7
 chardet==3.0.4
 docutils==0.15.2
 findspark==1.3.0